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MULLARD

12AX7 / ECC83 Mazda Valve Tested Pair Same Date Codes Short Gray Plates Halo Getter Made in England BVA

12AX7 / ECC83 Mazda Valve Tested Pair Same Date Codes Short Gray Plates Halo Getter Made in England BVA

24.900 ISK
24.900 ISK
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12AX7 / ECC83 Mazda Valve – Selected Pair – Same Codes I62 / IK12 – Short Gray Plates – Halo Getter – Made in England BVA

AMPLITREX Tested – VERY STRONG – Selected Vintage Pair – Same Codes – British Production

Description

This selected pair of 12AX7 / ECC83 Mazda Valves, Made in England BVA production, represents an interesting British vintage selection with homogeneous internal construction, same production codes, and overall very solid electrical characteristics.

The tubes feature a structure with short gray plates, a top halo getter, and Mazda Valve / BVA markings. The visible codes I62 / IK12 are present on both tubes, an important element for production, aesthetic, and structural consistency.

The codes stamped on the glass are I62 / IK12. The I62 code identifies the ECC83 / 12AX7 family in its second constructive revision; the factory/date code beginning with "I" is associated with Thorn-AEI / Ediswan, listed in Philips/Mullard lists as "Mullard supply". For this reason, the pair is cautiously indicated as probable 1960s British production.

The internal construction is the classic British short plate ECC83 of the period, very close to the 1960s Mullard architecture, with a compact, solid, and highly appreciated setup in both hi-fi and musical applications.

Sonic Characteristics

British ECC83 / 12AX7 with short plate structure are appreciated for a balanced, natural, and very pleasant musical presentation. This Mazda Valve pair offers the charm of vintage English production, with a generally refined, consistent, and well-controlled character.

Bass

The low register is orderly, natural, and well-proportioned. It doesn't aim for an excessively emphasized bass, but for a stable and controlled foundation, capable of supporting the music with balance.

Mids

The mids represent one of the most interesting aspects of this type of British ECC83. Vocals are present, natural, and well-articulated, with a pleasant harmonic texture and a rendition very suitable for jazz, vocal, classical, blues, and acoustic music.

Highs

The high range is sweet, refined, and well-integrated. Detail is present without becoming aggressive, with a setting suitable for prolonged listening and systems where musicality is sought more than artificial brilliance.

Dynamics

The dynamic response is fluid and well-controlled. The tubes maintain good legibility in complex musical passages, with a balanced and consistent rendition.

Soundstage

The soundstage is stable, orderly, and well-proportioned. While not a precision matched pair, the constructive consistency and electrical selection contribute to a natural and well-focused presentation in compatible circuits.

🎧 Use in Hi-Fi Amplifiers

This pair of 12AX7 / ECC83 Mazda Valves is suitable for preamplifiers, line stages, phono stages, driver stages, and hi-fi circuits compatible with ECC83 / 12AX7.

The British short plate construction and the presence of the same codes make this pair particularly interesting for those who want a vintage English ECC83 with musical character, good stability, and historical charm.

🎸 Use in Musical Amplifiers

In compatible instrument amplifiers, these ECC83 Mazda Valves can offer a musical, balanced, and harmonically rich response.

The British short plate construction is often appreciated in vintage and boutique guitar circuits, where it can contribute to a natural, dynamic, and well-controlled sound, with expressive mids and a composed high range.

They are suitable for preamplifier stages, drivers, and other compatible positions, always checking the device specifications.

🎯 Note for audiophiles and technicians

This pair represents a very interesting selection for those looking for two 12AX7 / ECC83 Mazda Valves Made in England BVA with:

  • same codes I62 / IK12;
  • homogeneous construction;
  • short gray plates;
  • halo getter;
  • overall electrical result VERY STRONG;
  • charm of vintage British production.

This is not a precision matched pair, but a Selected Vintage Pair chosen for production consistency, internal construction, and electrical solidity.

A valuable solution for those who want to bring the classic character of English ECC83 production into their system, in the full style of Vacuum Tubes Treasures.

Test Results:

Tube tested on AMPLITREX AT-1000 Tube Tester:

  • Test Conditions: Va = 250V ; Vg = -2V
  • Average 100%: Gm = 1600 ; Ia = 1.2 mA
  • Test Result: VERY STRONG

Tube #1:

  • Section 1: Gm = 1500 ; Ia = 1.0 mA
  • Section 2: Gm = 1800 ; Ia = 1.6 mA

Tube #2:

  • Section 1: Gm = 1300 ; Ia = 0.8 mA
  • Section 2: Gm = 1600 ; Ia = 1.1 mA
Additional tests performed:
  • Microphonics: Low. Suitable for many hi-fi and musical applications, particularly in line stages, drivers, and non-excessively critical preamplification positions.
  • Noise: Low and well-controlled. Silent operation in hi-fi and musical amplifiers in designated positions.
  • Balance: The sections are not perfectly aligned. The tubes are suitable for use in hi-fi in non-critical stages (input or driver) and in guitar amplifiers. Not recommended as a phase inverter or in applications requiring rigorous balance between sections.
  • Emission Quality: Excellent – Very strong and stable emission, without fluctuations.
  • Shorts and GAS: Absent.

Conditions:

  • Condition: Vintage Tubes - Tested and fully functional. Supplied in our custom box for optimal protection. 
  • Functionality: Perfectly operational.
  • Aesthetic Condition: Excellent – Markings well preserved, minimal signs of age. See photos for details.

Manufacturing Code: 

  • Stamped codes: I62 / IK12
    Type: ECC83 / 12AX7, revision I62
    Factory / supply: Thorn-AEI / Ediswan, Mullard supply
    Dating: 1960s British production

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Condizioni di vendita e sicurezza

Anti-Tamper Security Seal Policy:
Each product is sealed to guarantee quality and integrity.
The right of withdrawal is subject to the seal remaining intact, as provided for by the Consumer Code.

Eco-Friendly Packaging:
The tube will be shipped with protective packaging to ensure safety during transport.
We use recycled and recyclable paper for packaging, along with brown ECO-KRAFT adhesive tape, eco-friendly and solvent-free.

Important Notes:
This tube, manufactured according to the standards of its era, is designed to operate in equipment compatible with vintage tubes.
It is recommended to follow standard safety guidelines to avoid malfunctions or damage.

Safety Assurance:
Although not tested according to modern GPSR regulations, this tube was designed to operate safely under the conditions for which it was manufactured.
We recommend using it only with equipment that supports vintage tubes, in order to avoid risks of malfunction or damage.
Technical data note:
In some cases, the technical data provided may be based on datasheets from other manufacturers or on equivalent historical specifications, when a specific official datasheet for the production batch of the listed item is not available.
Electrical characteristics may vary slightly depending on the production batch and manufacturing period, as is typical for thermionic components.

Safety Information:
Warning: Keep out of reach of children.
To be used under adult supervision.
Use the product only with equipment designed for vintage tubes.

Shipping & Returns

Shipping & Returns

Shipping Costs

Shipping costs vary depending on the total amount of the items in the cart and are calculated automatically during the checkout process.
All shipments are fully insured. The courier is automatically selected based on destination, weight, and shipment characteristics.

Shipping Times and Delivery

The indicated delivery times are purely indicative.
Any delays, storage issues, or operational changes made by the carrier (for example during peak periods such as holidays) are not attributable to Vacuum Tubes Treasures.

In such cases, we will nevertheless provide the Customer with all necessary support to open claims or assistance requests with the appointed courier.

International Shipping (Non-EU Countries)

For orders shipped to countries outside the European Union, any customs duties, import taxes, or additional charges are the sole responsibility of the recipient.
Vacuum Tubes Treasures has no control over these costs, which may vary from country to country. Customers are therefore advised to contact their local customs authorities prior to placing an order.

Warranty

All products sold by Vacuum Tubes Treasures are covered by the legal warranty of conformity, in accordance with Italian Legislative Decree No. 206/2005 (Consumer Code) and the Italian Civil Code (Articles 1490 et seq.), under the conditions set out below.

Warranty for Vacuum Tubes

Vacuum tubes, being components subject to wear and of vintage or specialized nature, are covered by a specific warranty of 6 (six) months from the date of delivery.
The warranty covers exclusively proven manufacturing or conformity defects that arise during proper use in accordance with technical specifications.

The warranty does not cover:

  • normal wear and tear,
  • subjective sound preferences,
  • use in incompatible equipment,
  • tampering or improper use.

Right of Withdrawal

Purchases made on the Vacuum Tubes Treasures website are governed by Italian regulations on distance contracts (Legislative Decree No. 206/2005).

Consumers have the right to withdraw from the contract within 14 (fourteen) days from the date of receipt of the goods, without providing any reason.

Conditions for Exercising the Right of Withdrawal

The right of withdrawal may be exercised only if:

  • the product has not been used,
  • the product is returned in its original condition,
  • the tamper-evident security seal is intact and not broken.

📌 Returns are not accepted for reasons related to sound preference, tube rolling, or subjective audio evaluation.
As with a music recording, a vacuum tube cannot be returned simply because its sound does not match personal taste.

Effects of Withdrawal

In the event of a valid withdrawal:

  • all payments received, including standard shipping costs, will be refunded,
  • refunds will be issued within 14 days from receipt of the returned goods,
  • the refund may be withheld until the goods have been received and inspected.

Refunds will be made using the same payment method used for the original transaction, unless otherwise agreed.

Return Shipping Costs

Return shipping costs are borne by the Customer, except in cases of:

  • verified defective products,
  • errors attributable to Vacuum Tubes Treasures.

In such cases, return shipping costs will be fully covered by us.

Damaged or Incorrect Items

If the Customer receives a damaged or incorrect item, it must be reported within 5 (five) working days from delivery, by email or telephone, clearly stating the issue.

Uncollected Parcels, Storage, and International Shipments

It is the Customer’s responsibility to monitor the shipment and promptly arrange for collection or customs clearance.
Any costs, delays, or losses resulting from:

  • failure to collect the parcel,
  • prolonged storage,
  • abandonment of the parcel at customs,

do not entitle the Customer to any refund.

For further details, Customers are invited to consult the “Terms and Conditions” and “Refund Policy” sections of our website, or to contact us before placing an order.

Vacuum Tubes Treasures
www.vtt.store | www.vacuumtubestreasures.com
📧 info@vacuumtubestreasures.com

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  • ATTENTION PLEASE

    Please understand that the writing on the glass of vintage valves has become very delicate over the years and comes off easily. You must handle them with extreme care to avoid this. Wear and damage to the writing on the valves reduces their market value and causes damage. Please exercise extreme caution.

  • ATTENTION PLEASE

    We wish to inform you that any attempts to manipulate shipping destination information in order to obtain lower shipping rates may be considered fraudulent acts. Please provide accurate information and contact us if you have any concerns. We reserve the right to review and, if necessary, cancel orders that we deem to be in violation of our conditions. Thank you for your understanding and cooperation.